Example #1
0
        /// <summary>
        /// Prepares and sends the disconnect message to the specified remote endpoint.
        /// </summary>
        /// <param name="endpoint">Remote client.</param>
        /// <param name="code">Disconnection reason.</param>
        /// <param name="message">Optional text message for the user of the remote client.</param>
        /// <param name="data">Optional payload to further explain the disconnection reason.</param>
        /// <param name="removeAddressEntry">If true, the remote address will be removed from the `PresenceList`.</param>
        public static void sendBye(RemoteEndpoint endpoint, ProtocolByeCode code, string message, string data, bool removeAddressEntry = true)
        {
            using (MemoryStream m2 = new MemoryStream())
            {
                using (BinaryWriter writer = new BinaryWriter(m2))
                {
                    writer.Write((int)code);
                    writer.Write(message);
                    writer.Write(data);
#if TRACE_MEMSTREAM_SIZES
                    Logging.info(String.Format("CoreProtocolMessage::sendBye: {0}", m2.Length));
#endif

                    endpoint.sendData(ProtocolMessageCode.bye, m2.ToArray());
                    Logging.info("Sending bye to {0} with message '{1}' and data '{2}'", endpoint.getFullAddress(), message, data);
                }
            }
            if (removeAddressEntry)
            {
                if (endpoint.presence != null && endpoint.presence.wallet != null && endpoint.presenceAddress != null)
                {
                    PresenceList.removeAddressEntry(endpoint.presence.wallet, endpoint.presenceAddress);
                }
                //PeerStorage.removePeer(endpoint.getFullAddress(true));
            }
        }
Example #2
0
        // Sends perioding keepalive network messages
        private static void keepAlive()
        {
            forceSendKeepAlive = true;
            while (autoKeepalive)
            {
                TLC.Report();

                int keepalive_interval = CoreConfig.serverKeepAliveInterval;

                if (curNodePresenceAddress.type == 'C')
                {
                    keepalive_interval = CoreConfig.clientKeepAliveInterval;
                }

                // Wait x seconds before rechecking
                for (int i = 0; i < keepalive_interval; i++)
                {
                    if (autoKeepalive == false)
                    {
                        return;
                    }
                    if (IxianHandler.publicIP == "")
                    {
                        // do not send KA
                        i = 0;
                    }
                    else
                    {
                        if (forceSendKeepAlive)
                        {
                            Thread.Sleep(1000);
                            forceSendKeepAlive = false;
                            break;
                        }
                    }
                    // Sleep for one second
                    Thread.Sleep(1000);
                }

                if (curNodePresenceAddress.type == 'W')
                {
                    continue; // no need to send PL for worker nodes
                }

                try
                {
                    byte[] ka_bytes = null;
                    ka_bytes = keepAlive_v1();

                    byte[] address = null;

                    // Update self presence
                    PresenceList.receiveKeepAlive(ka_bytes, out address, null);

                    // Send this keepalive to all connected non-clients
                    CoreProtocolMessage.broadcastProtocolMessage(new char[] { 'M', 'H', 'W' }, ProtocolMessageCode.keepAlivePresence, ka_bytes, address);

                    // Send this keepalive message to all connected clients
                    CoreProtocolMessage.broadcastEventDataMessage(NetworkEvents.Type.keepAlive, address, ProtocolMessageCode.keepAlivePresence, ka_bytes, address);
                }
                catch (Exception e)
                {
                    Logging.error("Exception occured while generating keepalive: " + e);
                }
            }
        }
Example #3
0
        /// <summary>
        ///  Processes a Hello Ixian protocol message and updates the `PresenceList` as appropriate.
        /// </summary>
        /// <remarks>
        ///  This function should normally be called from `NetworkProtocol.parseProtocolMessage()`
        /// </remarks>
        /// <param name="endpoint">Remote endpoint from which the message was received.</param>
        /// <param name="reader">Reader object placed at the beginning of the hello message data.</param>
        /// <returns>True if the message was formatted properly and accepted.</returns>
        public static bool processHelloMessage(RemoteEndpoint endpoint, BinaryReader reader)
        {
            // Node already has a presence
            if (endpoint.presence != null)
            {
                // Ignore the hello message in this case
                return(false);
            }

            // Another layer to catch any incompatible node exceptions for the hello message
            try
            {
                int protocol_version = reader.ReadInt32();

                Logging.info(string.Format("Received Hello: Node version {0}", protocol_version));
                // Check for incompatible nodes
                if (protocol_version < CoreConfig.protocolVersion)
                {
                    Logging.warn(String.Format("Hello: Connected node version ({0}) is too old! Upgrade the node.", protocol_version));
                    sendBye(endpoint, ProtocolByeCode.deprecated, string.Format("Your node version is too old. Should be at least {0} is {1}", CoreConfig.protocolVersion, protocol_version), CoreConfig.protocolVersion.ToString(), true);
                    return(false);
                }

                int    addrLen = reader.ReadInt32();
                byte[] addr    = reader.ReadBytes(addrLen);

                bool   test_net     = reader.ReadBoolean();
                char   node_type    = reader.ReadChar();
                string node_version = reader.ReadString();
                string device_id    = reader.ReadString();

                int    pkLen  = reader.ReadInt32();
                byte[] pubkey = null;
                if (pkLen > 0)
                {
                    pubkey = reader.ReadBytes(pkLen);
                }

                endpoint.serverPubKey = pubkey;

                int  port      = reader.ReadInt32();
                long timestamp = reader.ReadInt64();

                int    sigLen    = reader.ReadInt32();
                byte[] signature = reader.ReadBytes(sigLen);

                // Check the testnet designator and disconnect on mismatch
                if (test_net != CoreConfig.isTestNet)
                {
                    Logging.warn(string.Format("Rejected node {0} due to incorrect testnet designator: {1}", endpoint.fullAddress, test_net));
                    sendBye(endpoint, ProtocolByeCode.incorrectNetworkType, string.Format("Incorrect testnet designator: {0}. Should be {1}", test_net, CoreConfig.isTestNet), test_net.ToString(), true);
                    return(false);
                }

                // Check the address and pubkey and disconnect on mismatch
                if (!addr.SequenceEqual((new Address(pubkey)).address))
                {
                    Logging.warn(string.Format("Pubkey and address do not match."));
                    sendBye(endpoint, ProtocolByeCode.authFailed, "Pubkey and address do not match.", "", true);
                    return(false);
                }

                endpoint.incomingPort = port;

                // Verify the signature
                if (node_type == 'C')
                {
                    // TODO: verify if the client is connectable, then if connectable, check if signature verifies

                    /*if (CryptoManager.lib.verifySignature(Encoding.UTF8.GetBytes(ConsensusConfig.ixianChecksumLockString + "-" + device_id + "-" + timestamp + "-" + endpoint.getFullAddress(true)), pubkey, signature) == false)
                     * {
                     *  CoreProtocolMessage.sendBye(endpoint, ProtocolByeCode.incorrectIp, "Verify signature failed in hello message, likely an incorrect IP was specified. Detected IP:", endpoint.address);
                     *  Logging.warn(string.Format("Connected node used an incorrect signature in hello message, likely an incorrect IP was specified. Detected IP: {0}", endpoint.address));
                     *  return false;
                     * }*/
                    // TODO store the full address if connectable
                    // Store the presence address for this remote endpoint
                    endpoint.presenceAddress = new PresenceAddress(device_id, "", node_type, node_version, Clock.getNetworkTimestamp() - CoreConfig.clientKeepAliveInterval, null);
                }
                else
                {
                    if (!CryptoManager.lib.verifySignature(Encoding.UTF8.GetBytes(ConsensusConfig.ixianChecksumLockString + "-" + device_id + "-" + timestamp + "-" + endpoint.getFullAddress(true)), pubkey, signature))
                    {
                        CoreProtocolMessage.sendBye(endpoint, ProtocolByeCode.incorrectIp, "Verify signature failed in hello message, likely an incorrect IP was specified. Detected IP:", endpoint.address);
                        Logging.warn(string.Format("Connected node used an incorrect signature in hello message, likely an incorrect IP was specified. Detected IP: {0}", endpoint.address));
                        return(false);
                    }

                    // Store the presence address for this remote endpoint
                    endpoint.presenceAddress = new PresenceAddress(device_id, endpoint.getFullAddress(true), node_type, node_version, Clock.getNetworkTimestamp() - CoreConfig.serverKeepAliveInterval, null);
                }

                // if we're a client update the network time difference
                if (endpoint.GetType() == typeof(NetworkClient))
                {
                    long timeDiff = endpoint.calculateTimeDifference();

                    // amortize +- 2 seconds
                    if (timeDiff >= -2 && timeDiff <= 2)
                    {
                        timeDiff = 0;
                    }

                    ((NetworkClient)endpoint).timeDifference = timeDiff;


                    // Check the address and local address and disconnect on mismatch
                    if (endpoint.serverWalletAddress != null && !addr.SequenceEqual(endpoint.serverWalletAddress))
                    {
                        Logging.warn(string.Format("Local address mismatch, possible Man-in-the-middle attack."));
                        sendBye(endpoint, ProtocolByeCode.addressMismatch, "Local address mismatch.", "", true);
                        return(false);
                    }
                }


                // Create a temporary presence with the client's address and device id
                Presence presence = new Presence(addr, pubkey, null, endpoint.presenceAddress);

                if (endpoint.GetType() != typeof(NetworkClient))
                {
                    // we're the server

                    if (node_type == 'M' || node_type == 'H' || node_type == 'R')
                    {
                        if (node_type != 'R')
                        {
                            // Check the wallet balance for the minimum amount of coins
                            IxiNumber balance = IxianHandler.getWalletBalance(addr);
                            if (balance < ConsensusConfig.minimumMasterNodeFunds)
                            {
                                Logging.warn(string.Format("Rejected master node {0} due to insufficient funds: {1}", endpoint.getFullAddress(), balance.ToString()));
                                sendBye(endpoint, ProtocolByeCode.insufficientFunds, string.Format("Insufficient funds. Minimum is {0}", ConsensusConfig.minimumMasterNodeFunds), balance.ToString(), true);
                                return(false);
                            }
                        }
                        // Limit to one IP per masternode
                        // TODO TODO TODO - think about this and do it properly

                        /*string[] hostname_split = hostname.Split(':');
                         * if (PresenceList.containsIP(hostname_split[0], 'M'))
                         * {
                         *  using (MemoryStream m2 = new MemoryStream())
                         *  {
                         *      using (BinaryWriter writer = new BinaryWriter(m2))
                         *      {
                         *          writer.Write(string.Format("This IP address ( {0} ) already has a masternode connected.", hostname_split[0]));
                         *          Logging.info(string.Format("Rejected master node {0} due to duplicate IP address", hostname));
                         *          socket.Send(prepareProtocolMessage(ProtocolMessageCode.bye, m2.ToArray()), SocketFlags.None);
                         *          socket.Disconnect(true);
                         *          return;
                         *      }
                         *  }
                         * }*/
                        if (!checkNodeConnectivity(endpoint))
                        {
                            return(false);
                        }
                    }
                }


                // Retrieve the final presence entry from the list (or create a fresh one)
                endpoint.presence = PresenceList.updateEntry(presence);
            }
            catch (Exception e)
            {
                // Disconnect the node in case of any reading errors
                Logging.warn(string.Format("Exception occured in Hello Message {0}", e.ToString()));
                sendBye(endpoint, ProtocolByeCode.deprecated, "Something went wrong during hello, make sure you're running the latest version of Ixian DLT.", "");
                return(false);
            }

            if (NetworkClientManager.getConnectedClients().Count() == 1)
            {
                PresenceList.forceSendKeepAlive = true;
            }

            return(true);
        }